Remove the main drain cover, this should take a couple of dives to fully remove the cover, but it can be done.Shut off the pump (very important!) and unplug from the power source.The steps to clearing a main drain line blockage is basically the same as clearing a skimmer-side blockage but with a couple of minor differences. Note: ALWAYS leave one line open and NEVER run your pump with all intake valves closed. If a specific line has lower pressure than the other lines, then you’ve found your blockage. To find out which specific pipe is blocked, run your pool pump and check each line by itself by shutting off the other lines (skimmer lines, main drain line) and looking at your filter’s pressure gauge. Your pump is unusually loud but the pressure is still low – this means that your pump is having a hard time creating a vacuum to pull in water.
Your skimmer basket is clear and your water level is fine, but water intake into your pump is slow – On the surface, everything looks normal but water is slow to enter your pool pump.Read more about pool pump pulsing or surge here. Your pool pump is pulsing or surging – if you’ve ruled out air leaks and your pool pump is pulsing or surging then you may have a clogged pipe.Here are some ways to tell if your pools lines are clogged (in this article, when we say clogged lines, it’s your suction lines and never the return lines, because return lines are fed with clean filtered water and there’s no chance for them to get blocked).
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